CN104406571B - The dimension sensor of a kind of object tilt angle on-line measurement and the method at measurement inclination angle thereof - Google Patents

Abstract

The invention belongs to small inclination field of measuring technique, the dimension sensor of specifically a kind of object tilt angle on-line measurement and the method at measurement inclination angle thereof. The present invention utilizes two measuring sensors being isolated in separately different metal insulating space to form a dimension sensor, measuring sensor comprises the annulus container of the inner hollow of the identical megohmite wall of container composition of thickness, the drive coil being wrapped on annulus container and two ruhmkorff coils, annulus internal tank is equipped with the magnetic liquid of its half volume, is exported the inclination angle obtaining and exporting plane to be measured by the voltage of ruhmkorff coil. The present invention also provides a kind of method at measurement inclination angle specifically. Present configuration is simple, and environmental compatibility is strong, can significantly improve the linear lag between the output voltage of sensor and inclination angle, measuring accuracy height.

Description

The dimension sensor of a kind of object tilt angle on-line measurement and the method at measurement inclination angle thereof

Technical field

The invention belongs to small inclination field of measuring technique, the dimension sensor of specifically a kind of object tilt angle on-line measurement and the method at measurement inclination angle thereof.

Background technology

When installing a complete equipment or when a set of equipment work age is permanent, always there is movement or the rotation of position in some important component, thus the working efficiency making object reduces, and even has an accident. In some electric pole after there is the disasters such as heavy rain, heavy snow, strong wind or rubble flow, electric pole also can tilt. When soldier fights, in order to can accurately hit, the inclination angle of fort sometimes also need measure. When detecting geological materials and engineering survey, in order to can accurately explore, its probe quality of balance also needs to measure. Dykes and dams displacement and bridge deformation control, earthquake earth's crust change monitoring etc. all needs the measurement carrying out pitch angle. In above all situations, it can be seen that the measurement at inclination angle great majority all carry out under very severe environment, in order to overcome these predicaments, invented a kind of accurately, the obliquity measurement sensor of reliable, efficient and low cost.

At present, the technology measuring inclination angle is also varied, it may also be useful to more scheme has the measurement of solid simple pendulum type, liquid pendulum-type to measure and gas pendulum measurement. These measuring methods also respectively have length, its advantage is that volume is little, weight is light, low in energy consumption, cost is low, reliability height, excellent performance, powerful, can produce in batches. Solid simple pendulum type measuring method, according to single pendulum motion principle, it makes simple, with low cost, but its error is big, useful range little (0-5 °). Pendulum type in-gas inclination survey sensor, its principle designs according to gas fluidity, and its great advantage is that shock resistance is good, but pendulum type in-gas inclination survey sensor is slowly corresponding, and the volume ratio of sensor is bigger.

Summary of the invention

Technical problem to be solved by this invention is: the object tilt angle transducer how providing a kind of simple structure, high precision.

The technical solution adopted in the present invention is: the dimension sensor of a kind of object tilt angle on-line measurement, base plate is the metal box of rectangular planes, inside is divided into two insulating spaces by a metal sheet, insulating space is inner installs the identical measuring sensor of a structure respectively, described measuring sensor comprises the annulus container of the inner hollow of the identical megohmite wall of container composition of thickness, the drive coil being wrapped on annulus container and two ruhmkorff coils, annulus internal tank is equipped with the magnetic liquid of its half volume, described measuring sensor is placed and its greatest circle diameter place plane orthogonal metal box base plate at insulating space, drive coil about annulus container upright metal box base plate greatest circle diameter symmetry and with metal box base plate close together, two ruhmkorff coils about annulus container upright metal box base plate greatest circle diameter symmetry and about the greatest circle diameter symmetry of parallel metal box plate, annulus container greatest circle diameter place plane orthogonal metal box base plate and two annulus container greatest circle diameter place planes are mutually vertical, the excitation source of drive coil is AC power, the two ends above of two ruhmkorff coils are connected by wire, two ends connection signal receiving trap below two ruhmkorff coils.

Utilize dimension sensor of the present invention to measure the method at inclination angle, carry out in accordance with the following steps:

Step one, the measuring apparatus that this dimension sensor forms is placed in plane to be measured, makes metal box base plate and plane parallel to be measured;

Step 2, the output voltage U obtaining two measuring sensors₁₁And U₁₂;

Step 3, the inclination angle exporting plane to be measuredWherein r is annulus container greatest circle radius, and R is coil winding radius, and λ is constant, and χ is susceptibility, N₀For the drive coil number of turn, N is number of inductive coil turns, and I is drive coil strength of current, and f is filtered frequency.

The invention has the beneficial effects as follows: present configuration is simple, environmental compatibility is strong, the linear lag between the output voltage of sensor and inclination angle can be significantly improved, measuring accuracy height.

Accompanying drawing explanation

Fig. 1 is measuring sensor contour structure figure of the present invention;

Fig. 2 measuring sensor scheme of installation of the present invention;

Fig. 3 is measurement of dip angle schematic diagram;

1, the first ruhmkorff coil, 2, connect wire, the 3, the 2nd ruhmkorff coil, 4, magnetic liquid, 5, drive coil, 6, output voltage, 7, actuation signal, 8, aluminium shell, 9, aluminum spacer plate, 10, the first measuring sensor, 11, wiring input output gate, the 12, the 2nd measuring sensor, 13, object tilt angle, 14, the first measuring sensor is surveyed inclination angle, and the 15, the 2nd measuring sensor is surveyed inclination angle.

Embodiment

As depicted in figs. 1 and 2, the dimension sensor of a kind of object tilt angle on-line measurement of the present invention, the aluminium vessel inside that bottom surface is plane is isolated into equal-sized two insulating spaces by aluminum spacer plate, the measuring sensor that a structure is identical is installed in insulating space respectively, measuring sensor comprises the glass annulus container of the inner hollow of the identical Glass Containers wall composition of thickness, the drive coil being wrapped on annulus container and two ruhmkorff coils, glass annulus internal tank hollow is equipped with the magnetic liquid of half volume, and magnetic liquid is selected with Fe₂O₃It is magneticsubstance with Co, kerosene is as base carrier fluid, using oleic acid as promoting agent, measuring sensor is vertically placed at insulating space, drive coil about annulus container upright metal box base plate diameter symmetry and with metal box base plate close together, two ruhmkorff coils about annulus container upright metal box base plate diameter and about the diameter symmetry of parallel metal box plate, described circle diameter is external diameter; Plane orthogonal metal box bottom surface, annulus container diameter place and two annulus container diameter place planes are mutually vertical, the excitation source of drive coil is AC power, the two ends above of two ruhmkorff coils are connected by wire, two ends connection signal receiving trap below two ruhmkorff coils.

Two ruhmkorff coils of the present invention form differential structure, improve sensor output sensitivity, aluminium vessel forms two enclosed spaces together with aluminum spacer plate, and two glass annulus vessel assemblys are placed in two spaces respectively, and aluminum spacer plate shields the mutual interference between two glass annulus containers.In order to play good shielding effect, wiring input, out gate, should be little as much as possible when ensureing that input and output line can pass.

If in drive coil, electric current is I=I in the first measuring sensor₀Sin ω t, the number of turn is N₀If the number of turn of ruhmkorff coil is N, the number of turn in air is N₁, the number of turn in magnetic liquid is N₂, then known N=N₁+N₂; If the output voltage of the first ruhmkorff coil is set to U₁, the voltage of air portion sub-coil is U₁', liquid portion coil voltage is U₁", then U₁=U₁'+U₁", if the output voltage of the 2nd ruhmkorff coil is U₂If magnetic permeability is μ in air₀=1, magnetic liquid relative magnetic permeability is μ_r。

When pitch angle, this pitch angle makes the first sensation coil be enclosed the increase of magnetic liquid volume, then

$N_1=N\frac{45-\mathrm{\α}}{90},N_2=N\frac{45+\mathrm{\α}}{90}$

There is the change contrary with the first ruhmkorff coil in the 2nd ruhmkorff coil simultaneously.

The voltage of ruhmkorff coil is

$U=-\frac{d\mathrm{\Φ}}{dt}=-\frac{{\mathrm{\μ}}_0{N}_0{N}_1{R}^{2}I\cos \mathrm{\ω}t+{\mathrm{\μ}}_r{N}_0{N}_2{R}^{2}I\cos \mathrm{\ω}t}{2r}$

By N₁, N₂Bringing into, the output voltage of the first ruhmkorff coil is

$U1=-\frac{{\mathrm{\μ}}_0{N}_0\[(45-\mathrm{\α})/90\]R^{2}Icos\mathrm{\ω}t+{\mathrm{\μ}}_r{N}_0\[(45+\mathrm{\α})/90\]R^{2}Icos\mathrm{\ω}t}{2r}$

The output voltage of the 2nd ruhmkorff coil is

$U2=-\frac{{\mathrm{\μ}}_0{N}_0\[(45+\mathrm{\α})/90\]R^{2}Icos\mathrm{\ω}t+{\mathrm{\μ}}_r{N}_0\[(45-\mathrm{\α})/90\]R^{2}Icos\mathrm{\ω}t}{2r}$

External output voltage

$U=U1-U2=\frac{N_0{\mathrm{NR}}^{2}Icos\mathrm{\ω}t}{90r}({\mathrm{\μ}}_0-{\mathrm{\μ}}_r)\mathrm{\α}$

In upper formula, R is coil winding radius, and r is for measuring annulus greatest circle radius.

Relative magnetic permeability μ_rIt is μ with the relation of susceptibility χ_r=1+ χ

$U=U1-U2=-\frac{N_0{\mathrm{NR}}^{2}Icos\mathrm{\ω}t}{90r}\mathrm{\χ}\mathrm{\α}$

The output pressure reduction of ruhmkorff coil after treatment after, the voltage of gained:

F be signal after filtering after frequency

If sensor sensitivity is k

ThenU=k α. λ is constant.

According to Fig. 3, the relation between two glass annulus vessel assembly gained angles and inclination angle can be obtained.

If α, β are two glass annulus vessel assembly gained angles, U₁₁、U₁₂Being two glass annulus vessel assembly gained output voltages, θ is inclination angle, U_oFor exporting resultant voltage signal.

Then can obtain

sin²θ=sin²α+sin²β

When measuring Small angle (-10 °-+10 °), it will be recognized that

θ²=α²+β²

?Namely draw:

$\mathrm{\θ}=\frac{r\sqrt{{U_{11}}^2+{U_{12}}^2}}{{\mathrm{\λ\χN}}_0{\mathrm{NR}}^{2}If}$

Namely the relation obtaining output voltage signal and surveyed between inclination angle.

Sensor output signal is undertaken measuring display by microcontroller, and its signal syntheses part realizes by software programming, and angle is measured in digital display on a display screen.

Claims (2)

1. the dimension sensor of an object tilt angle on-line measurement, it is characterized in that: base plate is the metal box of rectangular planes, inside is divided into two insulating spaces by a metal sheet, insulating space is inner installs the identical measuring sensor of a structure respectively, described measuring sensor comprises the annulus container of the inner hollow of the identical megohmite wall of container composition of thickness, the drive coil being wrapped on annulus container and two ruhmkorff coils, annulus internal tank is equipped with the magnetic liquid of its half volume, described measuring sensor is placed and its greatest circle diameter place plane orthogonal metal box base plate at insulating space, drive coil about annulus container upright metal box base plate greatest circle diameter symmetry and with metal box base plate close together, two ruhmkorff coils about annulus container upright metal box base plate greatest circle diameter symmetry and about the greatest circle diameter symmetry of parallel metal box plate, annulus container greatest circle diameter place plane orthogonal metal box base plate and two annulus container greatest circle diameter place planes are mutually vertical, the excitation source of drive coil is AC power, the two ends above of two ruhmkorff coils are connected by wire, two ends connection signal receiving trap below two ruhmkorff coils.

2. one kind utilizes the method at the dimension sensor measurement inclination angle of the object tilt angle on-line measurement described in claim 1, it is characterised in that carry out in accordance with the following steps:

Step one, the measuring apparatus that this dimension sensor forms is placed in plane to be measured, makes metal box base plate and plane parallel to be measured;

Step 2, the output voltage U obtaining two measuring sensors₁₁And U₁₂;

Step 3, the inclination angle exporting plane to be measuredWherein r is annulus container greatest circle radius, and R is coil winding radius, and λ is constant, and χ is susceptibility, N₀For the drive coil number of turn, N is number of inductive coil turns, and I is drive coil strength of current, and f is filtered frequency.